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Recoil-α-fission and recoil-α-α-fission events observed in the reaction 48Ca + 243Am

Forsberg, U. LU ; Rudolph, D. LU ; Andersson, L. L.; Di Nitto, A.; Düllmann, Ch E.; Fahlander, C. LU ; Gates, J. M.; Golubev, P. LU ; Gregorich, K. E. and Gross, C. J., et al. (2016) In Nuclear Physics, Section A 953. p.117-138
Abstract

Products of the fusion-evaporation reaction 48Ca + 243Am were studied with the TASISpec set-up at the gas-filled separator TASCA at the GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany. Amongst the detected thirty correlated α-decay chains associated with the production of element Z=115, two recoil-α-fission and five recoil-α-α-fission events were observed. The latter five chains are similar to four such events reported from experiments performed at the Dubna gas-filled separator, and three such events reported from an experiment at the Berkeley gas-filled separator. The four chains observed at the Dubna gas-filled separator were assigned to start from the 2n-evaporation channel 289115... (More)

Products of the fusion-evaporation reaction 48Ca + 243Am were studied with the TASISpec set-up at the gas-filled separator TASCA at the GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany. Amongst the detected thirty correlated α-decay chains associated with the production of element Z=115, two recoil-α-fission and five recoil-α-α-fission events were observed. The latter five chains are similar to four such events reported from experiments performed at the Dubna gas-filled separator, and three such events reported from an experiment at the Berkeley gas-filled separator. The four chains observed at the Dubna gas-filled separator were assigned to start from the 2n-evaporation channel 289115 due to the fact that these recoil-α-α-fission events were observed only at low excitation energies. Contrary to this interpretation, we suggest that some of these recoil-α-α-fission decay chains, as well as some of the recoil-α-α-fission and recoil-α-fission decay chains reported from Berkeley and in this article, start from the 3n-evaporation channel 288115.

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keywords
Element 115, Spontaneous fission, Superheavy elements, Uup, α decay
in
Nuclear Physics, Section A
volume
953
pages
22 pages
publisher
Elsevier
external identifiers
  • scopus:84965126643
  • wos:000378460700007
ISSN
0375-9474
DOI
10.1016/j.nuclphysa.2016.04.025
language
English
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yes
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cbb3a7c6-bb1d-417d-8405-9c640a52c762
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2016-05-17 23:12:57
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2017-07-09 04:50:20
@article{cbb3a7c6-bb1d-417d-8405-9c640a52c762,
  abstract     = {<p>Products of the fusion-evaporation reaction <sup>48</sup>Ca + <sup>243</sup>Am were studied with the TASISpec set-up at the gas-filled separator TASCA at the GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany. Amongst the detected thirty correlated α-decay chains associated with the production of element Z=115, two recoil-α-fission and five recoil-α-α-fission events were observed. The latter five chains are similar to four such events reported from experiments performed at the Dubna gas-filled separator, and three such events reported from an experiment at the Berkeley gas-filled separator. The four chains observed at the Dubna gas-filled separator were assigned to start from the 2n-evaporation channel <sup>289</sup>115 due to the fact that these recoil-α-α-fission events were observed only at low excitation energies. Contrary to this interpretation, we suggest that some of these recoil-α-α-fission decay chains, as well as some of the recoil-α-α-fission and recoil-α-fission decay chains reported from Berkeley and in this article, start from the 3n-evaporation channel <sup>288</sup>115.</p>},
  author       = {Forsberg, U. and Rudolph, D. and Andersson, L. L. and Di Nitto, A. and Düllmann, Ch E. and Fahlander, C. and Gates, J. M. and Golubev, P. and Gregorich, K. E. and Gross, C. J. and Herzberg, R. D. and Heßberger, F. P. and Khuyagbaatar, J. and Kratz, J. V. and Rykaczewski, K. and Sarmiento, L. G. and Schädel, M. and Yakushev, A. and Åberg, Sven and Ackermann, D. and Block, M. and Brand, H. and Carlsson, Gillis and Cox, D. and Derkx, X. and Dobaczewski, J. and Eberhardt, K. and Even, J. and Gerl, J. and Jäger, E. and Kindler, B. and Krier, J. and Kojouharov, I. and Kurz, N. and Lommel, B. and Mistry, A. and Mokry, C. and Nazarewicz, W. and Nitsche, H. and Omtvedt, J. P. and Papadakis, P. and Ragnarsson, I. and Runke, J. and Schaffner, H. and Schausten, B. and Shi, Yue and Thörle-Pospiech, P. and Torres, T. and Traut, T. and Trautmann, N. and Türler, A. and Ward, A. and Ward, D. E. and Wiehl, N.},
  issn         = {0375-9474},
  keyword      = {Element 115,Spontaneous fission,Superheavy elements,Uup,α decay},
  language     = {eng},
  month        = {09},
  pages        = {117--138},
  publisher    = {Elsevier},
  series       = {Nuclear Physics, Section A},
  title        = {Recoil-α-fission and recoil-α-α-fission events observed in the reaction <sup>48</sup>Ca + <sup>243</sup>Am},
  url          = {http://dx.doi.org/10.1016/j.nuclphysa.2016.04.025},
  volume       = {953},
  year         = {2016},
}